Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6540faaac230310…

MALICIOUS

PDF

43.6 KB Created: 2020-10-03 01:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ba7148f27c7bf940b8404eb9c236918a SHA-1: 1c3360865a344a3bb19357e8fd91928a9b9a1045 SHA-256: c6540faaac2303105a846f8e47d507dfe2c5903a987930bf8a0b0a27099ca804
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'ssat upper level verbal practice test pdf' and a URL that matches the malicious redirector. This suggests the document is designed to trick users into visiting malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=ssat+upper+level+verbal+practice+test+pdf In PDF document text
    • http://xabuvobi.clclockport.org/uploads/1/3/0/9/130969953/102586ff5415.pdfIn PDF document text
    • http://jubefak.speechmodification.com/uploads/1/3/1/6/131606575/wixuzovekojawo-dasutenawose-refakug-jajodoralad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1681d9-124b-4ffb-847d-41f6bd0f85d7/32615174710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac978cb-6ff9-413a-b5df-5306133c9f9b/81752996744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f94e4b8-7ffd-4af3-9257-9ad40f0350c8/wazofozatumed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9c3173-af4c-4638-963e-fc37d4ec3ee2/nazubuzatidunolexizatuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7412fe33-9e6b-4e69-9670-76fd5691c0e8/jijulix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7bfec5-c0c1-498e-ba73-adf82e52f111/ruzuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cf9295-3e8d-44b1-97fe-ffcba10a8aa7/49388348810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0145678-df98-4da4-bc5b-756001f7f1df/19323126260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/29071335862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/sujulerege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/plastic_sofa_legs_lowes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4364/7399/files/tupadadukelipelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5311/6320/files/2017_sec_football_helmet_schedule.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000680a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x680A 5452 bytes
SHA-256: b451c7dc3a497c7a300dcbfc025665d76d6bf0250b06b63b4b8e3a2dbbf4b64a
font_01_sfnt_off00007aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA4 10824 bytes
SHA-256: e7809846aae575780181e534793bc3b2393260944d7bbc5a678448f57d90fce8

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